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-3-7x=10x+9
We move all terms to the left:
-3-7x-(10x+9)=0
We get rid of parentheses
-7x-10x-9-3=0
We add all the numbers together, and all the variables
-17x-12=0
We move all terms containing x to the left, all other terms to the right
-17x=12
x=12/-17
x=-12/17
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